Composite magnetic material and electromagnetic interference suppressor member using the same
a technology of electromagnetic interference and suppressor member, applied in the field of composite magnetic materials, can solve the problems of inductive noise, frequency noise, and mainly caused by high frequency noise of active elements
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first example
[0138]Referring to FIG. 14, a printed circuit board 21 a is applied with the electromagnetic interference suppressing body using the composite magnetic material of the present invention. The printed circuit board are provided with the conductive circuit patterns 23, 25, and 29 and others thereon, which are omitted in the figure, in the similar manner as the conventional printed circuit board shown in FIG. 1.
[0139]The printed circuit board 21a of a first example, itself, has a different structure from the conventional one. That is, the first example of the printed circuit board 21a has a conductive support plate or a conductive soft magnetic support layer 75. The printed circuit board 21a, further, has a pair of composite magnetic layers 77a on both sides of the conductive support layer 75. The composite magnetic layer 77a comprises soft magnetic powder particles 79 and an organic binder 81. The composite magnetic layer 77 have a plurality of anisotropic magnetic fields and a plurali...
second example
[0140]Referring to FIG. 15, a second example of the printed circuit board comprises a conductive support layer 75 and composite magnetic layers 77b formed on both sides of the conductive support layer 75. The printed circuit board 21b further has a pair of dielectric layers 83 on both sides of the composite magnetic layers 77b in a different structure from that shown in FIG. 14. Accordingly, the second example of the printed circuit board has a structure wherein composite magnetic layers 77b are interposed between the conductive support layer 75 and each of dielectric layer 83. The composite magnetic layer 77b is similar to the first example and have a plurality of anisotropic magnetic fields and a plurality of magnetic resonances in the magnetic less term. Furthermore, the composite magnetic layer 77b also contains an organic binder 81 forming its matrix. Each of the dielectric layers 83 comprises a dielectric powder 85 and an organic binder 81. The organic binder 81 is contained f...
third example
[0141]Referring to FIG. 16, a third example of the printed circuit board comprises a conductive support layer 75 and composite magnetic layers 77c formed on both sides of the conductive support layer 75 (which is a similar reference number to the conductive support plate). Each of the composite magnetic layers 77c contains a soft magnetic powder 79, a dielectric powder 85 and an organic binder 81. The composite magnetic layer 77c has a different anisotropic magnetic fields in a similar manner to the first and second examples.
[0142]In the first to the third examples as mentioned above, the conductive support plate or conductive soft magnetic support layer 75 may be, for example, a conductive plate, a conductive mesh plate, or a woven fabric of conductive fibers, a metal plate such as a copper thin plate, stainless steel thin plate, aluminum thin plate and others, or a so called punched metal plate having fine holes formed in them, an expanded metal plate formed by fine-slitting a thi...
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Abstract
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